If The First Sliver's own cascade ability lets you cast another Sliver card, that Sliver won't have cascade
Exile one of those cards and put the rest on the bottom of your library in a random order
If timed right, this can one-shot almost any foe
Using this card, you will be guaranteed to get value out of it, as drawing is a mechanic that is core to any deck, and it will often mean you get to generate a bunch of free Treasure Tokens due to how brutal wasting two mana can be
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The intentional including of some weaker, not-on-theme cards for the reprint machine, like Brilliant Plan, Kongming, "Sleeping Dragon", or newer cards that weren't on theme like Tidal Force are the only things keeping the synergy from your deck from breaking people in the face unfairly